Elevator



H. V. M CORMICK July 31, 1928. I

ELEVATOR 2 Sheets-Sheet 1 7 Filed Jan. 29, 1927 July 31, 1928 H. v.-M coRM1cK ELEVATOR Filed Jan. 29, 1927 2 Sheets-Sheet 2 gjvwemtoz M WMZ MM Patented July 31, 1928.

UNITEDOSTATES PATENT 'orric z.

HAROLD V. MCCORMICK, OF LONG BEACH, NEW

MENTS, TO SHUR LOG ELEVATOR SAFE SEY, A CORPORATION OF NEW JERSEY.

YORK, A SSIGNOR,BY MESNE ASSIGN- TY CORYORATION, OF NEWARK, NEW JER- ELEVATOR.

A pplication filed January 29, 1927. Serial vNo. 164,415.

This invention is particularly concernedv particular object is toprovide means where by a switch in the motor control connections shall be opened when the shaft door receives effective openingmovement, the switch remaining open while the door is open or partially open so that the car cannot be moved while the door is open or partially open, notwithstanding accidental or inadvertent movement of the car v controller handle. Still another object is to prevent the possible opening of the shaft door as the car passes through the corresponding position Without stopping, the door releasing devices being inelfective while power is supplied to the motor which moves the car. ,"Other features of the invention will be referred to hereinafter in connection with the description of that embodiment of the invention which has been chosen for illustration herein. In the drawings, in which that embodiment of the invention is'illustrated- Figure 1 is a view partly in elevation and partly diagrammatic, showing so much of the complete elevator system, including the car, the electrical connections through which is controlled the operation of the electric motor by which the movement of the car' is effected or controlled, the car controller and its electrical connections, and a part of the devices through which the operation of the safety switch is effected or controlled, as is necessary to enable the invention to be understood, the shaft door being alsoindicated. a

Figure 2 is a view in elevation, as seen from the left hand in Figure 1 and on ,a larger scale, of the devices through'whic-h the operation of the safety switch is effected or controlled. I

Figures 3, 4 and 5 arefdetail views, mainly in elevation, of the devices directly in opera tive relation'with the shaft door, such devices being shown in part but on a smaller scalein Figure 2.

Figure 6 is a detail view in elevation illus-v tratlng a modificatlon of a portion of the switch operating devices.

In the drawings a portion of one of the shaft doors which guard the openings atthe several floors into the shaftway, is. indicated at a, such door being movable, as usual, to open or close the opening into the shaftway. It is shown as carrying a roller bearing stud a adapted to engage, in thelast of theclosing movementof the door, a forked lever Z) which is pivotally mounted on a bracket 6 fixed on the sill of the shaft open ing. The bracket is conveniently supplied with astop b to limit the movement of the forked lever in one direction and may also be conveniently provided with a stop tooth or detent b for a purpose to'be explained. Pivotally mounted on the forked lever b' is a bell'crank, thelonger arm 0 of which forms a dog for cooperation under-certain conditions with the'stop tooth or detent b above mentioned. The shorter arm 0 of the bell crank has pivotally connected thereto a link (Z which at its other end is pivotally connected to one armeofa bell crank, which is also mounted on the floor or sill of the shaft opening. The other arm '6 of this bell crank engages an arm f of athird bell crank pivoted on a bracket 7 on the floor or sill, the other and substantially vertical arm f carrying a roller 7 which is adapted to be projected by the effective opening movement of the door (it toward the car, which is sufliciently indicated at g, or toward a cooperating part carried the car, as will be described. Means,such as a spring 7, tend normally to press the arm f and its'roller 7 toward the car.

Normally the door a is locked against effective opening movement through the engagement of the dog 0, on the forked lever I), with the detent 72*, although the parts are so formed and proportioned that" the door may have a slight movement, perhaps to the eX- ion tent of an inch or so, in the opening ,direc- I the detent b so as to permit the forked lever b to swing from its initial position, shown in Figure 3, to or toward its final position, indicated in Figure 5, in which position the door is free for effective movement. Such resistance is offered only when the car is positioned with reference to the door to be opened and the means by which such resistance is offered is preferably carried by the car itself. Furthermore, the character of the resistance means is such that when it has served its purpose in unlocking the shaft door and the further movement of the projected member 7, it will itself be moved by the further movement of such projected member and will, by such movement, effect the opening of a switch in the motor control circuit which will prevent movement of the car while the door is open or partially open.

The devices involved in these operations will now be described.

As already stated, the dog 0, which engages the stop 0 to prevent effective movement of the forked lever b and therefore opening movement of the door, is one mem- .ber of a bell crank, the other member 0 of which is connected by a link (Z with the bell crank e by which the projecting movement of the member is effected. The bell crank c, 0 is held normally in its locking position, as shown in Figure 3, by the preponderance of weight of the dog or hell crank member 0 and if no resistance is offered to the movement of the projected member in the initial and ineffective opening movement of the shaft door and the corresponding movement of the forked lever b, the bell crank c, 0

will not be rocked on its pivot and the dog 0 will not be disengaged from the stop tooth so that the movement of the forked lever and the movement of the shaft door will be limited to a small extent, the door not being released for effective opening movement. If, however, resistance to the movement of the projected member f is offered, then the bell crank c, 0' will be rocked on its axis, the dog memberc will be disengaged from the stop tooth b the extent of its movement being limited by a shoulder formed on the lever b, and the lever b and the shaft door a will be released for ellective opening movement. In such movement the forked lever Z) will be swung from the position shown in Figure 3 to the position shown in Figure 5, whereby the roller a is released from the forked lever and the door is permitted to have its full opening movement. The further movement of the member 7, in the corn tinned movement of the forked lever Z), is taken advantage of, as already mentioned, to

effect the opening of the switch in the motor control circuit, so that the car cannot be moved.

In the embodiment of the invention 1llustrated, the device which offers the resistance to the movement of the projected member f necessary to effect the unlocking of the door and also acts in the continued movement of the forked lever b and the projected member to effect the opening of the switch, is a shoe h of suitable length and suitably formed, as indicated in Figure 2, which is movably supported on the car 9. As shown, the shoe his carried by an arm or slide it supported formovement in a horizontal dimotion in suitable guides 7L2. A toggle lever i is pivotally mounted, as at i, on a fixed part of the car and is connected at one end, as at 2' with a sliding bar mounted for movement-in guides k on. the arm or slide it which carries theshoe h. At'the other end an extension i of the toggle is connected by a link i with one member of a bell crank i supported by brackets g on the car. The othermember of the bell crank 71 is connected by a link i with one member of a bell crank 71', also supported on the car. The horizontal member of the bell crank i is preferably Weighted, as at 2' so that it tends normally, through the connections al ready described, to hold the toggle i with its members in line, with the bar is and the shoe h in their forward or lefthand positions, the shoe being then in the position to offer the required resistance to the initial movement of the roller or projected member 7, to effect the unlockingof theshaft door. The movement of the toggle in flattening is transmitted to the shoe it through bar 70, pivot is between the bar and crank 70 short arm of crank k pivot 70 (mounting the crank upon the slide h), andthe slide it to shoe h. Pivotal movement of crank la is resisted by linkage 0, 0' and 0 thus causing the slide to move outwardly.

As it is undesirable that any shaft door be unlocked when thecar is passing through the position of the door, without stopping, provision is made whereby the shoe h is retired from its unlocking position so long as power is supplied to the motor which effects or controls the movement of the car. As shown in Figure 1, there is connected to the weighted arm of the bell crank 2' the core Z of a solenoid Z which, through con nections indicated at Z isconnected into the armature circuit m of the motor m, (to the field coils of which current may be sup plied through connections at 972?, from the feed wires M as shown in Figure 1,) which efiects or controls the movement of the car, so that when power is supplied to the motor the solenoid is energized and the weighted arm 2' of the bell crank 2' is held against the action of gravity in such position that, as shown in Figure'2, the toggle i-is broken and the shoe h is withdrawn from the position in which it would otherwise offer the necessary resistance to the movement of the roller 7. When, however, power ceases to be supplied to the motor through the openingof the circuit in any manner, gravity acts on the weighted armz' to straighten the toggle i and hold theshoe *h in its forward position to offer the necessary resitance to the movement of the roller f The motor m and the usual control panel, indicated generall at n, not necessary to be described in detail herein, may be constructed and arranged as usual, being located usually in the pent house at the top of the elevator shaft. i v c Although the shoe It offers, in its forward position, the relatively slight degree of resistance necessary to eifect the unlocking of the shaft door, as already described, it is also itself susceptible of movement rearwardlyiorto the right hand in Figure 2 by the continued projection of the roller-f in the continued movement of the forked lever b afterit has-been released and this movement of the shoe, (which can take place, as

will beZunder-stood, only when the effective opening movement of the door] has commenced) is taken advantage of to open a switch in the control circuit of the elevator motor so that the car cannot be moved after the effective opening movement of the car and door has commenced. To effect this result, the bar -/v,to which the forward end of the toggle z is pivotally connected, as already described, is engaged through a pin 70' with the vertical arm of the bell crank 76 pivotallymounte'd, as at 76 on the arm or The horizontal arm ofthe bell crank 70 is connected through a link 0 with one arm of the bell crank 0, also supported by the brackets g, the other arm of the bell crank 0' being connected through a link 0 with an arm 2) of a switch 7, a we'ighted arm f being applied to the axis of the switch and tending to move the switch from closed to open position. 7 5 i It will be understood that the controller 8 is connected to the control panel at in sub stantiallythe usual manner,-except for the introduction of the interlock switch 39, and that when the contact maker 8 is moved to one side or the other it closes the circuit through the terminals s es ,'or s 8 as thecase may be, from the'feed wires m through the connections 434", as the case may be, to one or the other of the relay magnets t, t, thereby closing the circuit through the armature coils of the elevator motorm to drive it in one direction or the other asmay be r or not thecontroller s is in position to start the car. -As the switch p isopened as soon as effective opening movement of a shaft door has commenced, the car cannot be started, despite accidental or unintentional movement-of the controller from neutral position to starting position.

It will beunderstood that inthe operation-of the devices described, when power is cut oif 'fromj the motor m it is also cut off from the solenoid or other elect-roi-motive device Z with the result that the weighted member 2' drops, the link i is moved to the right, the link it is moved upward and the toggle i is flattened. As the weighted member 79 of the switch 79' offers, through' the arm p, link 0 ,'bell crank o and link 0, resist ance to the rocking of the bell crank 70 on its pivot on slide it, the flattening of the toggle i, acting through the sliding bar is,

the pin is hell crank 717 and pivot-le on slide it will cause the slide it andthe shoe h to move forward. Similarly, when the electro-motive device Z is energized, as it will be when power is supplied to the motor m, the toggle 2' will be broken and the slide It and shoe 72; will be withdrawn. therefore, the motor m is energized to move the car up or down, the shoe h is withdrawn so that it fails to offer the resistance neeessary to the releasing of the door and the door therefore cannot be opened so long as power is suppliedto the car. Furthermore, when the car has been stopped and the door has received effective opening movement, the movement of the door, actingthrough the arm f will thrust the shoe it backwarchso When, 7

that the bell crank k which is pivoted on the slide it, then finding its fulcrum on the then *nected with it the linkt. A stop arm t is formed with the bell crank to limit the motion. It will be understood that the stalled motor 6 is connected into the circuit of the elevator motor in the same manner as already described with respect to the solenoid Z-, so that when power is supplied to the motor'mof the elevator the motor 15 f is. energized'and holds the bell crank 25 t in position, shown'in Figure 6, against the influence of gravity on the weighted arm. t of thebell crank, substantially as already described with respect to the arrangement shown in F igure 1, while if the circuit of the mainfmotor m is opened-the circuit of the motor t will also be opened and gravity will act through the weighted arm 25 to straighten the toggle z' in the same manner as already described.

It will be understood that various changes in details of construction and arrangement can be made to suit different conditions of use and that, except as pointed out in the accompanying claims, the invention is not restricted to the particular construction and arrangement shown and described herein.

I claim as my invention:

1. In an elevator having a shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under the control of the controller, a locking device normally preventing effective opening movement of the door, means in operative relation with the look ing device to release the door, means carried by the car for cooperationwith said last named means to eifect release of the door when the car is positioned with respect to the door, a switch mounted on the car and included in the connections to control the motor, and connections whereby the switch is opened by the movement of the last mentioned means. I

2. In an elevator having a shaft door, a car, a motor to operate the car, a car con troller on the car and means to supply power to the motor under the control of the con troller, a locking device normally preventing effective opening movement of the door,

' smeans including a movable member to operate the locking device to release the door in the initial movement of the door when resistance is offered to the movement of said movable member, and means carried by the car to oifer the required resistance to the movement of the movable member.

3. In an elevator havinga shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under the control of the controller, a locking device normally preventing effective opening movement of the door, means including a movable member to operate the locking device to release the door in the initial movement of the door when resistance is offered to the movement of said movable member, yielding means carried by the car to offer the required resistance to the movement of the movable member and to move with the movable member in its continued movement after the unlocking of the car, and devices operated by the continned movement of said yielding means to prevent the movement of the carby the motor.

4. In an elevator having a shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under the control of the controller, a locking device normally preventing effective opening movement of the door, means including a movable member to operate the locking device torelease the door in the initial movement of the door when resistance is offered to the movement of said movable member, yielding means carried by the car to offer the required resistance to the movement of the movable, member and to move with the movable member in its continued movement after the unlocking of the car, a switch, mounted on the car and included in the connections to control the motor, and devices whereby the switch is opened by the continued movement of the said yielding means.

5. In an elevator having a shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under thecontrol of the controller, a locking device normally preventing effective opening movement of the door, means to operate the locking device to release the door, means carried by the carfor cooperation with said last named means to eifect release of the locking device when the car is positioned with respect to the door, said last mentioned means being movable out of operative position, and devices interconnected with the motor controlling means to withdraw said movable means from operative position when power is supplied to the motor.

6. In an elevator having a shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under the control of the controller, a locking device normally preventin g effective opening movement of the door, means to operate'the locking device to release the door, means carried by the car for cooperation with said last named means to effect release of the locking device when the car is positioned with respect to the door, said last mentioned means being movable out of operative position, and electromechanical devices inter-connected with the motor controlling means to withdrawsaid movable means from operative position when power is supplied to the motor.

7. In an elevator having a shaft door, a car, a motor tooperate the car, a car controller on the our and means to supply power to the motor under the control of the corn troller a locking device normally preventing effective opening movement of the door, means to operate the locking device to release the door, means carried by the ear for cooperation with said last named means to effect release of the locking device when the car is positionedwith respect to the door,

said last mentioned means being movable out of operative position, electromechanical devices inter-connected with the motor controlling means to withdraw said movable means from operative position when power is supplied to t 1e motor, switch Ii'ii sited on the car and included in the connections to control the motor, and means in operative relation with said movable means to open the switch and prevent movement of the car when the effective opening movement of the door has commenced.

8. In an elevator having a shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under the control of the controller, a locking device normally preventing effective opening movement of the door, means in operative relation with the locking device to release the door, means carried by the car for cooperation with said last named means to effect release of the door when the car is positioned with respect to the door and movable into and out of operative position, and means to efiectmovement of said last mentioned means and including an electro-motive device to determine the operation of said last mentioned means, said electro-motive device being included in the connections with the car motor to receive power only when the car motor receives power.

9. In an elevator having a shaft door, a car, a motor to operate the car, a car controller on the car and means to supply power to the motor under the control of the con troller, a locking device normally preventing effective opening movement of the door,

means in operative relation with the locking device to release the door, means carried by the car for cooperation with said last named means to effect release of the door when the car is positioned with respect to the door and movable into and out of operative position, and means to effect movement of said last mentioned means and including an electro-motive device to determine the operation of said last mentioned means, said electro motivedevice beingincluded in the connections with the car motor to receive power only when the car motor receives power, a switch mounted on the car and included in the connections to control the car motor, and means to operate the switch.

10. In an elevator, the combination of a door, a forked lever mounted on the door sill in position to be engaged by the door, a bracket supporting the lever and a stop tooth, a bell crank mounted on the lever and having one arm formed as a dog to engage a stop on the bracket, a link connected to the other arm of the bell crank, and means to prevent movement of the link in the initial movement of the door and lever to cause the bell crank to be rocked on its axis and the dog to be disengaged fromthe stop.

This specification signed this 27th day of January, A. D. 1927. V

HAROLD v. MoCORMIGK. 

